View from Monte Ragogna in NE direction to the S rim of the Alps. The Tagliamento is considered the most important of the few remaining largely unmanaged rivers in the Alps. Over much of the 178 km on its way from the Mauria Pass to the Adriatic Sea, it forms a braided river system extending over a wide floodplain. In its lower part, the surface runoff sometimes disappears due to infiltration, but reappears farther downstream.